Pocketknife



G. E. BLOW Sept. 192.4.

POCKETKNIFE Filed Jan. 15 1924 GEORGE- EnwIN Brow, or srnvnnner., ENGLAND.

POGKETKNIFE. l

I l 1,507,043 PATENroF Applicationled January 15, 1924. Serial No. 686,323. v

To all whom t may' concern:

Be it known that I, GEORGE 'EDWIN BLow, subject of the' King. of Great Britain and Ireland, residing at 87 High Street, Stevenage, in thecounty of Hertfordshire, England, have invented a new and useful Pocketkn'i'fe, of which the following is a specification.

This invention relates to improvements 1n pocket and' like knives and has for its object to provide means on the knife whereby the cutting blade .or blades will be automatically sharpened so as to maintain a goed cutting edge. A

According to this' invention, the blade or bladesv al1-'ej arranged to slide ylongitudinalflyr in the handle toj withdraw the' blade for use or to return it to the handlewhen not required.` The sliding movement ofthe blade or blades is utilized to maintain them inra sharpened condition by causing steels or other sharpening means to engage the cutting edge as they'are slidden in or' out of the handle. Suitable means are provided to lock the blade orbla'des in the open .or closed position and for` this purpose a pivoted bar preferably of springy materialrnay be provided with a projection or progections adapted to be pressed into a recess or recesses in the blade' or blades andto be locked therein by a suitable catch or slide. The blade or blades may vthusv be llocked in position for use o-r will be retained in the handle'when not required.

n order that my' invention may be more readily' understoodV reference' is had to the accompanying sheet of drawings which show an embodiment of my invention as applied to a single blade pocket knife, as an example, and in which :e Y

Fig. 1 is a perspective view o-fa pocket knife with the blade withdrawn ready for use. l y Fig. 2 is a longitudinal section of the same, and' Y Fig. 3 is a plan thereof.

Fig. 4- is an end view.

Fig. 5 are details of the two sharpening steels, and i Fig. 6 is a sectional detail showing aL modiiication. f

Referring to Figs. 1, 2, 3, 4: andl 5*, the knife comprises a slidable blade 1l pointed atits forward endv 2 and formed with a block 3v adapted to slide in a casing L1. This casing 4 comprises a pair' of side/plates 5 Fics. g

securedupon opposite sides of a separating strip 6 by means of screws 7 passing through the sidev plates 5 and lugs 8 at eachxend' of the separating strip 6. The forward end of this separating'strip 6 is providedwith a' filling block 9 slotted at 10 tof permit the knife blade l to slide through it.v The rear end of thel strip 6 is provided with an end block 11 to close the end of the casingfand.

form an abutment against which the'blade block yengages-when the knife blade is drawn into the casing.

The blade block 3- is provided with a pair of ringer pieces 12y which project lthrough slots '141 in the side plates 5 and are pro-y vided with rou'ghened surfaces so as to permit them to 'be readily gripped between the finger and thumb to enable the blade block 3 Vto be moved longitudinally in the casing 4 so as to withdraw' orreturn'the knife [I blade from or. into ,the Vcasing as require-d."

In the filling block 9 at the forward-end of the strip 6 are located a pair of sharpening steels 15 (shown in detail in Fig. 5) and which are provided withv cutting edges 1G as shown.

These sharpening steels 15 are'A located in holes17 ydrilled-at an angle in i the filling block 9 as shown in Fig. 4' so that the steels 15 cros'scl'ose to the cuttingl edge of the knife blade 1. In therback of the casing 4 is located a springy vstripv 1S pivoted to the side plates at 19 and extending along the length of the casing .so as to lill thespace between the side 'plates and' the filling block 9 and end platefl'l.l This springy strip 18 is provided with` a projecting knob 20 near its forward end`v which =resiliently presses upon the back of the knife bladeV 1, and so resiliently urges its cutting edge 1 toward the sharpening steelsl.

Then therefore the knife blade 1 is withdrawn or returned lto the casing the cuttingedges 16 of the sharpeningv steelsA 15 will act uponl the-knife'blade to .keep it sharp and in oood 'condition for use. i

In order to lock'the blade block 3 and the xknife blade 1 in the openor closed position,

a recess 21 is Yformed in `theyblade-block 3 y and a second recess 22 in the back ofthe blade near its forward end. A slide-Q3 is mounted on the casing 4 bymea'ns of turned over edges 24 which engage in grooves 25 in the side plates 5. VVh'enthis slideV 23 is moved toward the forward end ofthe casing-4 Vit will act to "lockthe projecting knob QGfin the recess21 the blade block 3 When the knife blade is Withdrawn as shown in Fig. 2. If however the blade l is drawn into the casing then the projecting knob 2O will engage in the recess 22 in the back of the blade l and upon moving the slide to the forward end of the casing` it Vwill be locked therein so as to prevent accidental withdrawal of the knife blade.

Referring now to Fig. 6 this shows a slight modification in which the blade block 3 is provided With a screwdriver end 26 which may be made to project through a slot 27 formed in the end plate ll if the blade block is moved from its normal closed position to- Ward this end plate 11, and in an opposite direction to the movement required to Withdraw the knife blade l from the forward end of the casing 4. A second locking slide 28 is then provided to lock the blade block 3 in this position by holding a projecting knob 29 on the rear end of the. springy strip 18 in the recess 2l on the blade block. This projection 29 Will also act to prevent the screwdriver end 26 from being pushed out through the end of the casing 4 when returning the knife blade to the casing after use. This will be effected if' the slide 28 is retained at the rear end of the casing when it will hold the projecting knob 29 in a position to engage the end of the blade block when it is moved to return the knife blade after use.

I claim l. In a pocket knife, a casing, at least one blade slidably mounted therein, sharpening means arranged at the end of the casing to operate on the cutting edge of the blade, spring means to hold the cutting edge of the blade in engagement with the sharpening means and a locking device for securing the blade in the open or closed position.

2. In a pocket knife, a casing comprising a pair of side plates and a separating strip Whose ends are apertured to slidably receive blades, at least one blade slidably mounted therein, sharpening means arranged at the end of the casing to operate kon the cutting` edge of the blade, spring means to hold the cutting edge of the blade inl engagement with the sharpening meansand a locking device for securing the blade in the open or closed position.

3. In a pocket knife, a casing, a blade holder mounted to slide in the casing, finger pieces projecting through slots therein, at least one blade attached to the blade holder. sharpening means arranged at the end of the casing to operate on the cutting edge of the blade, spring mea-ns to hold the cutting edge of the blade in engagement with the sharpening means and a locking device for securing the blade in the open or closed position. j,

4. In a pocket knife, a casing comprising a pair of side plates and a separating strip Whose ends are apertured =to slidably receive blades, a blade holder mounted to slide in the casing, finger pieces projecting through slots therein, at least one blade at-` tached to the blade holder, sharpening means f arranged at the end of the casing to operate on the cutting edge of the blade, spring means to hold the cutting edge of the blade in engagement with the sharpening means and a locking device for securing the blade in the open or closed posit-ion.

5. In a pocket knife, a casing comprising pair of side plates kand a separating strip Whose ends are apertured to slidably receive blades, at least one blade slidably mounted therein, sharpening means arranged at the end of the casing to operate on the cutting edge of the blade, a spring strip alongjthe back of the casing, to hold the cutting f edge of the blade in engagement with the sharpening means, projections on the spring strip adapted to engage recesses in the blade and at least one slide on the casing to lock these projections therein for securingtheA blade in the open orclosed position.

6. In a. pocket knife, a casingcomprising a pair of side plates and a separating strip Whose ends are apertured to slidably receive blades, a blade holder mounted toV slide in the casing, finger pieces projecting through slots therein, atleast one blade attached to the blade holder, sharpening means arranged at the' end of the casing to operate on the cutting edge of the blade, a

spring strip along the back of the casing to hold the cutting edge of the blade inengagement with the sharpening means, projections onthe spring strip `adapted to engage recesses in the blade and atleast one slide on the casing to lock these projections therein for securing the blade in the open or closed position.

7. In a pocket knife, a casing, at least one bladev slidably mounted therein, sharpening means comprising'a pair of steels set at an angle and arranged at the end of the casing to operate on the cutting edge of the blade, spring means to hold the cutting edge of the blade in engagement` With the sharpening i edge of the blade, spring means to hold the cutting edge of the yblade in engagement with the sharpening means and a locking` device for securing the blade in the open or closed position.

9. In a pocket knife, a easing comprising a pair of side plates and a separating strip Whose ends are apertured to slidably receive blades, a blade holder mounted to slide in the easing, finger pieces projecting through slots therein, at least one blade attached to the blade holder, sharpening means comprising a pair of steels set at an angle and arranged at the end of the casing to operate on the cutting edge of the blade, a spring strip along the back of the strip between the side plates, end blocks to this strip apertured to permit a knife blade to pass therethrough, a blade block adapted to slide in the casing, linger pieces on each side of the blade block and which project through the slots in the side plates, a blade at one end of the blade block adapted to slide through the aperture in one end block, a pair of steels arranged at an angle in this end block one one each side of the blade, a spring strip along theback ofthe casing which presses the blade between the sharpening steels, a projection on this strip adapted to enga-ge recesses 'in the blade and the blade block', and a slide on the casing adapted to hold the projections on the spring strip in either recess in the blade or blade block.

. 11. In a pocket knife, a easingcomprising a pair of slotted side plates, a separating strip between the side plates,'end blooks to this strip apertured to permit a knife blade to pass therethrough, a blade block adapted to slide in the casing, finger pieces on each side of the blade block, and which project through the slots in the side plates, a blade at one endof the blade block adapted to slide throughthe aperture in one end block, a pair of steels arranged at an angle in this end block one on each side of the blade, a spring strip along the back ofthe casing which presses the blade' between the sharpening steels, projections on this strip adapted to engage recesses in the vblade and the blade block, a Second blade on ,the other end of the blade block andl a pair off slides to hold projections on the springst-rip in recesses in the blades or blade block.

'GEORGE EDWIN BLOlV. 

